I need a little help with these questions. Thanks for any and all suggestions:

1. Find the intersection of the lines:

a. (a_1)z + (a-bar_1)z-bar +b_1 = 0
b. (a_2)z + (a-bar_2)z-bar +b_2 = 0

2. Show that the lines OA and OB are perpendicular iff:
a(b-bar) + (a-bar)b = 0.

3. Find the area of the triangle whose vertices have the affixes:
a. 0, 1, 3-2i
b. 0, 1, z
c. 3, 2i, 3+2i
d. 5-3i, 2+i, -1+2i